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#Macos中使用python-unrar出现错误：
#LookupError: Couldn’t find path to unrar library.
#是因为Macos须要和Win或Linux一样首先安装RAR官方的库。
#首先 brew install unrar
#然后 pip3 install unrar

附录：brew install unrar多次失败：

1. brew install unrar出现Error: unrar: undefined method `cellar’ for #BottleSpecification:0x00007f96fe886d40
   重装brew后仍然出现，执行操作：
   cd /usr/local/Homebrew/Library/Taps/homebrew/
   rm -rf homebrew-core
   git clone https://github.com/Homebrew/homebrew-core.git

2. 找不到https://blog.csdn.net/qwe641259875/article/details/114001192
   brew install carlocab/personal/unrar
   Error: unrar: Failed to download resource “unrar”
   Download failed: https://www.rarlab.com/rar/unrarsrc-6.1.7.tar.gz

放弃，
手动安装https://www.jianshu.com/p/0c74476d939f